Title Search [BP OP 4-1] The effect of perioperative fluid volume restriction in postoperative complication of pancreaticoduodenectomy Jangho PARK (National Cancer Center, Korea) [BP OP 4-2] Drainage procedures for postoperative fluid collection after pancreaticoduodenectomy: A comparison of endoscopic ultrasound guided and percutaneous drainage Da Hee WOO (University of Ulsan, Korea) [BP OP 4-3] Incidence, risk factors, and outcomes of jejunal varices of the afferent loop after pancreatoduodenectomy Mizelle D'SILVA (Seoul National University, Korea) [BP OP 4-4] Comparing survival rate and appropriate surgery methods according to tumor location in T2 gallbladder cancer Min Kyu SUNG (University of Ulsan, Korea) [BP OP 4-5] “New is always better”: Single center experience of over 200 cases of robotic single site cholecystectomy comparing the new da Vinci SP with the previous Si/Xi systems Young-Dong YU (Korea University, Korea) [BP OP 4-6] Cholecystectomy versus Conservative treatment in patients with acute cholecystitis over 80 years old after percutaneous transhepatic gallbladder drainage Seung Jae LEE (Konyang University, Korea) [BP OP 4-7] Comparable oncologic outcome of minimally invasive pancreaticoduodenectomy for common bile duct cancer compared with open pancreaticoduodenectomy: A Propensity score matched analysis Kyungchul LEE (University of Ulsan, Korea)